Age and genesis of the ji’an Pb-Zn deposit in the east of Jiao-Liao-Ji Belt, NE China

IF 3.2 2区地球科学 Q1 GEOLOGY

Ore Geology Reviews Pub Date : 2025-04-22 DOI:10.1016/j.oregeorev.2025.106613

Yanpeng Liu , Jinggui Sun , Yang Liu , Chuntao Zhao , Xiaolei Chu

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Abstract

The Jiao-Liao-Ji Belt (JLJB) is located in the northeast of the North China Craton, which is a gathering place for polymetallic deposits dominated by magmatism. The Ji’an Pb-Zn deposit is situated in the eastern region of the JLJB, where ore bodies were hosted in the Cambrian brecciated limestone. Four mineralization stages have been identified here: the retrograde skarn (Pre-ore), early quartz-sulfide (I), late quartz-sulfide (II) and quartz-carbonate (III) stages. Fluid inclusions (FIs) include three types which are gas-dominated (W₁-type), liquid- dominated (W₂-type) and pure-liquid (PL-type) FIs. During the Pre-ore and I Stages, the hydrothermal fluids are characterized by a H₂O–NaCl ± CO₂ composition, with temperature variations spanning 271–474°C and salinity levels ranging from 4.32–13.30 wt% NaCl eqv. The latter stages, however, are characterized by a simpler H₂O–NaCl system, with temperatures and salinity levels measured at 131–283 °C and 2.39–9.6 wt% NaCl eqv, respectively. Isotopic analysis of hydrogen and oxygen suggests that these hydrothermal fluids predominantly originate from magmatic source, with subsequent admixture with meteoric waters. Furthermore, in-situ sulfur isotope studies indicate the magmatic genesis of the Pb-Zn sulfides in the Stage II, whereas the Stage III sulfides are deduced to derive from both magmatic and sedimentary sources. in-situ lead isotopic data further infer that the origins of the Pb-Zn minerals are linked to the crust and orogenic belts. Hydrothermal apatite has a U-Pb age of 119 ± 3.4 Ma, which constrain the formation of the deposit to the Early Cretaceous. According to comparative assessments with typical deposits, the Ji’an Pb-Zn deposit is a skarn type formed by metasomatic interactions between subsurface granitic magmas and the limestone of the Zhangxia Formation during the Early Cretaceous. Immiscibility and mixing of hydrothermal fluids play an important role in metal deposition.

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胶辽冀东吉安铅锌矿床时代及成因

胶辽集带位于华北克拉通东北部，是岩浆活动为主的多金属矿床聚集地。吉安铅锌矿床位于JLJB东部，矿体赋存于寒武纪角化灰岩中。成矿阶段分为四个阶段：逆行矽卡岩期（前矿石期）、早期石英硫化物期（ⅰ期）、晚期石英硫化物期（ⅱ期）和石英碳酸盐期（ⅲ期）。流体包裹体包括气控型（w1型）、液控型（w2型）和纯液控型（pl型）三种类型。前矿期和ⅰ期热液流体以H2O-NaCl±CO2组成为特征，温度变化范围为271 ~ 474℃，盐度范围为4.32 ~ 13.30 wt% NaCl eqv。然而，后期阶段的特点是更简单的H2O-NaCl体系，温度和盐度水平分别为131-283℃和2.39-9.6 wt% NaCl eqv。氢和氧的同位素分析表明，这些热液主要来源于岩浆，随后与大气水混合。此外，原位硫同位素研究表明，II期铅锌硫化物的岩浆成因，而III期硫化物则推断为岩浆和沉积双重成因。原位铅同位素数据进一步推断，铅锌矿物的成因与地壳和造山带有关。热液磷灰石的U-Pb年龄为119±3.4 Ma，矿床形成于早白垩世。通过与典型矿床的对比评价，吉安铅锌矿床为早白垩世地下花岗质岩浆与张夏组灰岩交代相互作用形成的矽卡岩型矿床。热液流体的非混相和混合在金属沉积中起着重要作用。

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来源期刊

Ore Geology Reviews 地学-地质学

CiteScore

6.50

自引率

27.30%

发文量

546

审稿时长

22.9 weeks

期刊介绍： Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.